Tagged Questions

2
votes
3answers
1k views

Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller

I have a device which provides a USB port. If I attach it to a Windows PC it is recognized as a "CP2103 USB to UART Bridge Controller". According to the device documentation, it should communicate in ...
3
votes
3answers
503 views

Trouble in using MT3329 SKM53 GPS module

I bought a SKM53 GPS module a few months ago. I tried hard to make it work but couldn't get anything out of it. I was thinking it's a fault with the device (actually i thought i burned it by not ...
2
votes
2answers
479 views

Atmega8 USART transmitting wrong data

I'm trying to get USART working on my atmega8-16PU microcontroller. I've studied the documentation and took the examples of code from there. I've managed to transmit the data from microcontroller to ...
1
vote
1answer
126 views

I2C Communication Speed across Sensors

I'm curious as to how fast I can communicate between multiple sensors. I have a board with an adxl345 digital accelerometer and an itg3200 3-axis MEMS gyro on I2C. I'm trying to build an IMU which ...
0
votes
1answer
175 views

AVR Serial communication using DB9 Connector

I was using a PL2303 chip before to perform serial communication with an atmega128. It recently started getting hot and was not being detected by the computer anymore. These chips are not readily ...
0
votes
1answer
425 views

RX String on UART not working

I am having some problems with UART communication with the RN-42 SM Bluetooth module. Currently, I am just using polling to get communication going. I have my source files below. The problems is that ...
1
vote
1answer
289 views

UART Communication Issues

I am using a UART to communicate with RS232 on a Roving Networks RN-42 SM bluetooth module. I have the transmitter and receiver connected to a logic analyzer. The issue that I am having is that my ...
1
vote
2answers
603 views

Arduino UNO Timer issue

i seem to be facing a weird issue here. First time working with AVR timers. Basically what I am trying to achieve is to set timer2 (with prescaler val @ 1024) and use CTC mode (with val 78) to get 5ms ...
3
votes
2answers
2k views

atmega 328 serial communication

I'm trying to get the atmega328 to communicate over serial port with my pc. I'm using hyperterminal to echo back the keyboard character entries. I'm using the max3232 chip to do the communicated with ...
3
votes
3answers
339 views

What is the point of Buffers like this in Programmers?

So this is a schematic for an AVR Programmer seen here: http://www.sparkfun.com/products/9825 On the bottom you will see a 74AC125 which is a Quad Buffer with Tri-State Outputs. I've seen quite a ...
2
votes
0answers
237 views

Why there is no respond on rs232 port

We are working on communication between AVR and a Crous PTZ. We can see some details about Crous communication ports on page 15 of its guide : We found Crous protocol doc (Got it here) and now we ...
1
vote
2answers
512 views

UART signal distortion with AVR

While evaluating the Libelium Waspmote board for wireless sensor networks, we discovered a strange communication problem. We tried to set up a link between the waspmote and another board via UART at ...
1
vote
0answers
344 views

Communication between AVR and CORUS PTZ device

12 NULL bytes are being sent to CORUS device (to power on it) with this codevision code like putchar('\0'); Sending is ok , but regarding to page 9 of the ...
9
votes
2answers
1k views

Unit testing AVR assembly language

How do you unit test your assembly code? I'm working on a serial servo controller as part of a hexapod robot project and the code has got to the point where it's becoming complicated ;) Anyway, I'm ...
13
votes
9answers
7k views

Ideal WiFi to Serial (or SPI) bridge?

What are some recommendations on an ideal WiFi to Serial bridge? My ideal qualities would be: Simple connectivity, SPI or Serial Reasonable fast speed, at least 1mbit/sec ideally (though probably ...